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8<title>Postfix and Linux</title>
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16<h1><img src="postfix-logo.jpg" width="203" height="98" ALT="">Postfix and Linux</h1>
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19
20<h2>Berkeley DB issues</h2>
21
22<p> If you can't compile Postfix because the file "db.h"
23isn't found, then you MUST install the Berkeley DB development
24package (name: db???-devel-???) that matches your system library.
25You can find out what is installed with the rpm command. For example:
26</p>
27
28<blockquote>
29<pre>
30$ <b>rpm -qf /usr/lib/libdb.so</b>
31db4-4.3.29-2
32</pre>
33</blockquote>
34
35<p> This means that you need to install db4-devel-4.3.29-2 (on
36some systems, specify "<b>rpm -qf /lib/libdb.so</b>" instead). </p>
37
38<p> DO NOT download some Berkeley DB version from the network.
39Every Postfix program will dump core when it is built with a different
40Berkeley DB version than the version that is used by the system
41library routines.  See the DB_README file for further information.
42</p>
43
44<h2>Procmail issues</h2>
45
46<p> On RedHat Linux 7.1 and later <b>procmail</b> no longer has
47permission
48to write the mail spool directory. Workaround: </p>
49
50<blockquote>
51<pre>
52# chmod 1777 /var/spool/mail
53</pre>
54</blockquote>
55
56<h2>Syslogd performance</h2>
57
58<p> LINUX <b>syslogd</b> uses synchronous writes by default. Because
59of this, <b>syslogd</b> can actually use more system resources than
60Postfix.  To avoid such badness, disable synchronous mail logfile
61writes by editing /etc/syslog.conf and by prepending a - to the
62logfile name:  </p>
63
64<blockquote>
65<pre>
66/etc/syslog.conf:
67    mail.*                          -/var/log/mail.log
68</pre>
69</blockquote>
70
71<p> Send a "<b>kill -HUP</b>" to the <b>syslogd</b> to make the
72change effective.  </p>
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